Yoke riveter



. Patented Mar. 6, 1945 N D TES PATENT orrlce YOKE RIVETE R Alfred H.-Haberstum p, Detroit, Miclr, assignor to The Murray Corporation of America, Detroit, Mich, a corporation of. Delaware 1942, Serial No. 449,283

I Application July 1,

, 4 Claims.

This invention relates to yoke riveters and particularly to the control of the operation thereof, the principal object being the provision of foot operatedmeans. for selectively or automatically controlling the operation of the riveter from a shiftablyselected point.

Objects of the invention include the provision of an air operated yoke riveter so constructed .and arranged that the operation thereof may be controlled automatically or'selectively by a workman without'remo'ving his hands from the work being riveted; the provision of aconstruction as above described in which the operation of the riveter may be controlled by a single workman regardless of the size of the piece of work being operated upon and, therefore, regardless of his relative position with respect to the riveter: the provision of means for controlling the operation of an air operated yoke type riveter ineluding a foot operated control device shiftable at'will by the operator to correspond with the position in which'he stands in holding a piece of work to be riveted; the provision ofa construction as above described including a control I device for the riveter, fixed with respect thereto manner in which the Bowden wire is connected thereto.

The principal object of the present invention is a suitable adaptation of the control devices disclosed and claimed in my copending applications for Letters Patent oi the United States for I improvements in Fluid operated timing devices.

the riveter; and the pro-vision of apparatus of I the type described that is sim le in construction; efiicient in operation and economical to manufacture.

The above being among the objects of the oresent invention thesame consists in certain novel parts to be hereinafter described with reference to the accompanying drawing. and then claimed,

having the above and other objects in view.

In the accompanyin d awing which illustrates a suitable embodiment of the present invention, andin which like numerals refer to like parts in both views, '7

Fi ure 1 is a broken side e evational view of a yoke type air operated riveter equipped with control mechanism in accordance with the present invention, the foot operated portion of the control mechanism being illustrated in enlarged size;

Fig. 2 is a vertical sectional view taken transversely through the control device illustrated in Fig. 1, and as on the line 22 thereof; and v Fig. 3' is an enlarged, fragmentary, vertical 1 sectional view taken centrally through the trigget for the fixed control device illustrating the 35- featuresof construction and combinations of filed April 3, 1942, and serially numbered 437,486, and for Pneumatic timing device, filed April 15, 1942, and serially numbered 439,115, to a yoke typeof air operated riveting machine or riveter. The timing devices disclosed and claimed in my aboveidentified applications are operated by the tinued and cannot be discontinued beforehand.

and in the second application means are provided whereby upon pulling the trigger of the control device through only part of its possible full movement the riveting hammer may be caused to operate as long as the trigger is thus'partly depressed but when the trigger is fully depressed then the riveting hammer will operate as in the case of the first application, that is for a predetermined length of time upon the termination of which operation will be discontinued. The

details of construction of these control devices maybe understood by referring to said applications but for the purposes of the present invention it may be assumed that the control device shown in the accompanying drawing operates inthe manner of that in the second application above identified.

"The control devices disclosed and claimed in my above identified applications were particularly adapted for use in connection with soportable and conventionally employed by'workmen on a substantially fixed structure requiring the riveter to be moved relative to the work and requiring an additional workman for each riveter to buck the rivet being driven. The present invention deals with the application of the control quires that the workman doing the rivetingbe called'hand riveters, that is riveters which are operate the riveter by his foot it is necessary that the foot control portion of the device be readily shiftable on the floor to correspond with the different positions required of the operator in the performance of his work, and the present invention satisfies this requirement.

Referring now to the accompanying drawing a conventional yoke type riveter is indicated gen erally at H and as being rigidly supported on a base l2 which may be a bench, a suitable stand or the like positioned at the proper distanc from the floor for the convenience of the operator in manipulating the work into a position to be operated thereon. The upper arm of the yoke carries the usual cylinder l4 within which the usual piston (not shown) is reciprocably received and with which the -hammer I6 is operatively associated in a conventional manner. The hammer l6 is'normally maintained in its raised position by means of a coil spring l8 cooperating*betweenit and the hammer guide at the lower end of the cylinder M. The lower arm of the yoke carries a conventional anvil 22 vertically aligned with the hammer l6 and against which the work being operated upon is adapted to rest.

The upper arm of th yoke is provided with suitable air passages therein in accordance with conventional practice, and suitable connections 24 connect these passages with a control device indicated-generally at 26 and which, for instance, maybe the control device of either of my prior applications above identified, but preferably that in the second of said applications. This control device 26 is provided with an operating trigger 28 through manipulation of which operation of the riveter, either wholly automatic as in my first application above-identified, or selectively automatically or manually as in my second application above-identified, may be controlled.

In accordance with the present invention in Bowden Wire 30 with the trigger 28 a bracket 38 is fixed-to theyokelfl below and in line with the free end of the trigger '28 with its outer end fixedly clamped to one end of the casing 32 for the Bowden wire. A collar such as 40 is preferably secured to the casing 32. immediately above .thebracket 38 asan added precaution to prevent relative. movement between the .casing and the bracket 38. The corresponding end of the wire 34., as best illustrated in Fig. 3, projects freely through a hole 42 provided in the handle 28' directly above the bracket 38 and above the handle the wire 34 is provided with an enlarged head 44 forming an abutment of a size too large to pass through the hole 42. Surrounding the wire 34 between the collar 40 and the handle 28 is a coiled compression spring 46 which constantly urges the trigger 28 toward its opened or riveter operating position indicated by dotted lines in Fig. 1.

The control device 36 includes a flat sheet metal base 50, one end 52 of which is upwardly bent into perpendicular relationship with respect to the plane thereof. The opposite end is provided with a bracket 54 thereon to which the corresponding end of the casing 32 of the Bowden wire 30 is rigidly secured. Between the opposite ends of the base a pair of sheet metal members are secured to the upper face thereof. These members each comprise an outer horizontal flange portion 56 suitably secured as by welding to the opposite sides of the base 58, upwardly extending and relatively widely spaced side wall portions 58 forming a housing between them, and inwardly ofiset but spaced vertically extending flange portions 60. A sheet metal bell crank 62 is closely but relatively slidably received between the upstanding flanges and is, pivotally mounted therebetween by means of a pin 64 projecting therethrough and through the flanges 6B. The lower arm of the bellcrank 62 projects downwardly into the chamber formed between the side walls 58 and the upper arm thereof is disposed in a generally horizontal direction, and is provided with a relatively wide contact plate 66 thereon. The corresponding end of the wire 34 is secured to the free end portion of the lower arm of the bellcrank 62 so as to move equally therewithjat all times. A relatively stiff coil tension spring 68 is tensionedbetween the loweren d of the downwardly projecting arm of the bellcrank B2 and the upwardly bent end 52 of the base 50 and partly projects within the chamber formed by the side walls 58 and, therefore, constantly acts to turn the bellcrank 62 in a counterclockwise direction as viewed in Fig. 1. In order to prevent movement of the bellcrank 62 beyond the amount required to properly actuate the trigger 28and thereby endanger stretching of the spring 68 beyond its elastic limits during movement thereof in a clockwise direction under the force of the operators foot, a stop pin 10 is preferably projected through the flanges 6B in intersecting relation with respect to the path of movement of the lower arm of the bellcrank 62 to limit such movement. v V V v I The spring 68 is of greater'st'rength than the spring 46 so that when no pressure is applied to the outer end of the upper arm of the bellcrank 62 the spring 68 pulls the wire 34 against the force of the spring 46 and moves the trigger 28 to closed position. When the outer end of the upper arm of the bellcrank 62 isdepressed by the operator pressing his foot. against the same the wire 34 is pushed through the casing 32;thds tending to raise the button 44 with respect to'the trigger 28', upon the occurrence of which the spring 45 is free to cause the trigger 28 to follow the movement of the button 44 upwardly.- 'If the bellcrank is depressed to such an extent that the wire 34 is moved'a further distance than that required. for moving thetrigger 28 from-its closed position to its fully open position, .then the button 44 will simplymove upwardly above thetrigger 28 while the spring 46 holds the trigger 28 in its fully open position and'without endangering putting. any undue stress. on the trigger 2841s might occurif the wire. 34 was fixed with respect to the, trigger 2.8.

. The Bowden wire (ill beingfiexible and the control device 36 preferably resting on the floor without being fixed to the floor, the latter may be shifted to any position convenient to the operator of the riveter as he shifts his position with'respect to the riveter to handle the particular piece of work being acted upon. Thus the workman as he is operating the riveter may simply push the control device 36 with his foot to any desired position and without takinghis hands from the work and by pressing down on the contact-plates 66 with the toe of his foot may cause the riveter to operate. Under such circumstances if the controldevice 26 is'of the type disclosed and claimed in my first co-pending application above described, then when the operator presses down upon the contact plate 56 a s'uiiicient distance to cause the riveter to operate, it will operate a predetermined number of strokes for a predetermined length of time and then automatically close off, the operator having no controlover it in the meantime. On

the other hand if the control device 26 is of the said trigger to a position'permitting said control device to operate a second control device, and spring operated means interconnecting said trigger and said second control'device for exerting greater spring pressure than said first spring for preventing said first spring from operating said trigger.

3. In combinationwith an air operated yoke I type riveting machine, a control device fixed'with' v respect to said machine for controlling the flow of ,air thereto, a trigger for actuating said control device, a spring for urging said trigger to apo-sition to permit said control device to operate; a second control device relatively freely shiftable with respect to said machine and adapted to be supported upon a floor, a movable element on said second control device, a Bowden wire intermatically then all that is required is that he 7 simply push the bellcrank down to the full extent of its movement.

Having thus described my invention what I claim by Letters Patent is:

1. In combination with an air operated type riveter, a control device fixed with respect to said riveter for controlling the operation thereof, a spring for operating said device, a second control device adapted to be shiftably supported on a floor, a flexible connection interconnecting said control devices, and a spring on said second device operating through said flexible connection to prevent said first spring from operating said first device. I i v 2. In combination with an air operated yoke type riveting machine, a control device fixed with respect to said machine admittingoperating air to said machine and for cutting off the supply of connecting said element-with said trigger for con trolling movement of the latter through movement of the former, and spring means constantly urging said element toward one limit of its movable posii tions to have said Bowden wire retain said trigger and spring'in a position t prevent the operation of said control device.

4. In combination with an airjoperated yoke type riveting machine, a control device associated therewith controlling the flow of air thereto and operable .to discontinue the fiow of air thereto upon the termination of a predetermined timeperiod, a control'trigger associated with said control device for, initiating operation thereof, afoot operated control device shiftable with respect to said machine and including a foot operated element movably associated therewith, a Bowden wire extending betweensaid element and said trigger with the interior wire thereof secured atone end for movement with said element and freely projecting at its opposite ends through saidtriggenan abutment button on said wire element on the side of said trigger opposite said element, spring means constantly urgingsaid air thereto after a predetermined length of operation of said machine, a trigger for conditioning trigger toward engagement with said abutment button, and a spring urging said foot operating elementto'move said wire to have-said button engage said trigger and prevent the first spring from functioning.

ALFRED H. HABERSTUMP.

said

said control device for operation, a spring urging 

